Sharp Kabushiki Kaisha Corporation

Takeshi Katoh

Yoshinori Urata

Keiichi Kikawa

Yoritaka Tsubaki

Kazuya Korematu

Toshihisa Ishida

Mitsuhiro Hasegawa

Takeshi Takayama

Osamu Wada

Tadanori Kano

Hiroki Maeda

Yuya Kondo

Shoji Nakai

Maiko Nagaoka

A two-component developerincludes a carrierand a toner. The carriersatisfies the relationships 100&#x2264;&#x3b1;&#x2264;220 and 300&#x2264;&#x3b2;&#x2264;480 when a voltage is applied in 1 V steps by a bridge resistance measurement method, where &#x3b1; (V) is a carrier voltage value obtained when a current value flowing through the carrierreaches 1.0(A), and &#x3b2; (V) is a carrier voltage value obtained when the current value reaches 1.0(A).

Two-component developer, developing device, and image forming device

A toner contains at least a crystalline polyester resin and an amorphous linear polyester resin that uses diethylene glycol as an alcohol component, and a monoester wax and a montan ester wax as release agent components, wherein 6&#x2264;&#x3b1;&#x2264;8 and 14&#x2264;mw/&#x3b1;&#x3c;30 are satisfied, where &#x3b1; represents an amount of the crystalline polyester resin added relative to 100 parts by weight of the amorphous linear polyester resin and mw represents an amount of the montan ester wax added.

Toner, two-component developer, and method for producing toner

A two-component developing agent containing a carrier which can maintain a charge-imparting property to a toner at a high level for a long period of time, does not generate flying of the carrier and can correspond to an image forming apparatus of present day having a long operation life and can form a high-quality image having high image density and sharpness, is provided. In the two-component developing agent containing a carrier in which a resin coating layer is formed on a surface of a core material, and a toner, in which an X-ray intensity of an alumina particle by a fluorescent X-ray analysis, the amount of the alumina particle to be used to the resin coating layer is adjusted such that it comes to be smaller than the X-ray intensity by the fluorescent X-ray analysis of a metal contained in a largest amount in the core material.

Carrier and developing agent for electrophotography

A carrier excellent in durability and environmental stability and a two-component developing agent is provided. In the carrier, a core material is coated with a resin, and the coating resin is formed on the core material such that the coating resin comes to be in an amount of 5% by weight to 20% by weight on the basis of a weight of the core material, thereby enhancing durability. Further, the coating resin contains fine particles of titanium oxide, thereby enhancing environmental stability.

Coated carrier and two-component developing agent

A durable two-component developing agent for electrophotography is provided that can not only suppress scattering of a toner into an inside of an apparatus but also obtain a high image density and can stably obtain a high-quality image even in use for a long period of time. The two-component developing agent for electrophotography includes a toner, and a carrier. The carrier contains a core material and a coating layer formed on a surface thereof. The coating layer is a silicone resin coating layer containing dendritic titanium oxide. Therefore, it is possible to not only suppress scattering of the toner but also obtain a sufficient image density and to form a high-quality image without reducing the image density even in use for a long period of time.

Two-component developing agent for electrophotography

Growing community of inventors

Nara, Japan

Takeshi Katoh